Am 02.06.2011 14:43, schrieb Benjamin Bellec: > Hello, > > I performed several tests of the logbase2() function. > This function is defined and used in these files:
btw you could probably make it faster if you'd just use the x86 BSR instruction - at least newer intel cpus handle that with a throughput of 1 per clock... (though you'd need special case for 0 since it's undefined otherwise). I don't think there's any portable way to take advantage of that instruction however. It shouldn't be in a performance critical path however, so any decent portable implementation should do (FWIW you could replace the the += with |= but for newer cpus it most likely doesn't make a difference). Roland _______________________________________________ mesa-dev mailing list mesa-dev@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/mesa-dev
